Appendix C: Operator Troubleshooting
C–21502C MTDR User Manual
Preset front panel and
turn the
power on.
Is
there a
greed display?
YES
NO
Is the
power source a
battery?
Did
“Initializing”
message appear
on LCD?
YES
NO
YES
NO
Check line voltage switch for correct setting
and change if necessary. With VOM, check
wall outlet voltage and plug in somewhere
else if no voltage. Check fuse and power
cord for near zero Ohms.
Turn instrument off
immediately to avoid
possible damage to
LCD display.
If error
message(s)
appear, follow
the displayed
instructions.
Using VOM, check for
near zero Ohms in
fuse.
Is
waveform
missing, erratic or
badly
distorted?
NO
YES
Perform initial
operator
performance
verification checks.
Did instrument pass
checks?
YES
NO
DO NOT USE INSTRUMENT.
Serious problems need repair. Refer
to 1502C Service Manual
Troubleshooting procedures.
Refer to Option Port
and Accessories Troubleshooting
procedure.
If no accessories, then OK to use
instrument.
Replace fuse.
YES
NO
Is
fuse
OK?
Operator Troubleshooting